I think it's kind of amusing that, given that the book basically invented 'power armour', that the movie had them running around in gear on that a Vietnam vet would wince at.
Electronic Kevlar?
More Iron Man, actually, assuming you mean what I think you mean.
I have heard that the movie makers were afraid that including powered armor would have required an immense and risky investment in special effects.
That is, lots of expensive CG work that produced unrealistic results.
I did see some sketches of powered armor in a "Starship Troopers" movie book.
Also, the Bugs in the movie would have gotten stomped. The Bugs in the book had their own guns, nukes and star ships.
Too bad. Heinlein did a great job of describing how the armor would work, and what wearing it would be like. I was hoping to see some of that.